This reverts commit 8f68e392.

Reason for revert: depot_tools started using Python3 by default with this deps roll, but it contained a Python3 bug. Reverting this and waiting for a new deps roll will fix the issue since the latest depot_tools contains the fix for this issue.

Original change's description:
> Update V8 DEPS.
>
> Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/26e9d48..de373bb
>
> Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/032c783..054d61d
>
> Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/2b2aec6..e3a49aa
>
> Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/105a846..a560ab4
>
> TBR=machenbach@chromium.org,tmrts@chromium.org
>
> Change-Id: I04a2522f65cecb00308bdc0a8f7ed780fe4f3961
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2119950
> Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
> Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
> Cr-Commit-Position: refs/heads/master@{#66851}

TBR=machenbach@chromium.org,v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com,tmrts@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: chromium:1065807
Change-Id: I87281218c99c55503f577b9ab17b2d3b59792601
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2132796
Commit-Queue: Tamer Tas <tmrts@chromium.org>
Reviewed-by: Tamer Tas <tmrts@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66962}